Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K6/00—Preparations for dentistry
  • A61K6/60—Preparations for dentistry comprising organic or organo-metallic additives
  • A61K6/62—Photochemical radical initiators
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K6/00—Preparations for dentistry
  • A61K6/80—Preparations for artificial teeth, for filling teeth or for capping teeth
  • A61K6/884—Preparations for artificial teeth, for filling teeth or for capping teeth comprising natural or synthetic resins
  • A61K6/887—Compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K6/00—Preparations for dentistry
  • A61K6/80—Preparations for artificial teeth, for filling teeth or for capping teeth
  • A61K6/884—Preparations for artificial teeth, for filling teeth or for capping teeth comprising natural or synthetic resins
  • A61K6/891—Compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
  • A61K6/896—Polyorganosilicon compounds

Definitions

• the field of the invention is that of dental compositions. More specifically, the dental compositions developed in the context of the present invention can be used for the production of dental prostheses and for dental restoration.
• the object of the present invention is to provide new dental compositions which do not have the drawbacks of the prior art.
• These new dental compositions which can be polymerized and / or crosslinked in the oral environment, have markedly improved qualities, in particular with regard to the very marked reduction in the phenomenon of withdrawal of the dental compositions used for the production of dental prostheses or dental restorative materials.
• the polymerizable and / or crosslinkable dental composition according to the invention comprises:
• - Z is an organic substituent comprising at least one reactive epoxy function, and / or alkenylether and / or oxetane and / or dioxolane and / or carbonate, and preferably Z being an organic substituent comprising at least one reactive function epoxy and / or dioxolane, • and at least two silicon atoms;
• the dental composition is polymerizable and / or crosslinkable under activation by the thermal route or by the photochemical route.
• photochemical activation is carried out under UN radiation. More particularly, a UN radiation is used. of wavelength on the order of 200 to 500 nm for the production of dental prostheses and UN radiation. visible wavelength greater than 400 nm for the production of restorative materials.
• a wavelength greater than 400 nm allows crosslinking and / or polymerization in an oral environment.
• the silicone polymer or oligomer (1) has the advantage over organic resins of being transparent to UN light. -visible and therefore its use makes it possible to obtain very thick materials and the photocrosslinking takes place in a short time.
• the reactive functions Z of the silicone polymer or oligomer (1) can be very varied. However, particularly advantageous dental compositions are obtained when the silicone oligomer or polymer (1) comprises at least one unit (FS) in which Z represents an organic substituent Z1 comprising at least one reactive epoxy and / or dioxolane function, and preferably at least one reactive epoxy function.
• the silicone oligomer or polymer (1) with at least one reactive epoxy function Z1, and / or dioxolane, and preferably at least one reactive epoxy function can:
• the dental composition can also comprise other oligomers and / or silicone polymers comprising other reactive functions Z2 such as the alkenylether, oxetane and / or carbonate functions and optionally reactive functions Z1 .
• reactive functions Z these can be chosen in particular from the following radicals:
• the silicone polymer or oligomer consists of at least one silicone of the following average formula:
• the cationic photoinitiators can be chosen from the borates of an organometail complex (taken alone or as a mixture between them) of an element from groups 4 to 10 of the periodic classification [Chem. & Eng. News, vol. 63, No. 5, 26 of February 4, 1985].
• the cationic entity of borate is selected from the organometallic salts of formula (II):
• • M represents a metal from group 4 to 10, in particular iron, manganese, chromium, cobalt
• L * ! represents 1 ligand linked to the metal M by ⁇ electrons, ligand chosen from the ligands ⁇ ⁇ -alkyl, ⁇ 5- cyclopendadiènyl and ⁇ 7 ⁇ cycloheptratriènyl and the compounds ⁇ ⁇ - aromatic chosen from the ligands ⁇ ⁇ -benzene and the compounds having from 2 to 4 condensed cycles, each cycle being capable of contributing to the valence layer of the metal M by 3 to 8 ⁇ electrons;
• L 2 represents a ligand linked to the metal M by ⁇ electrons, a ligand chosen from the ⁇ ⁇ -cycloheptatrienyl ligands and the ⁇ ⁇ -aro atic compounds chosen from the ⁇ 6-benzene ligands optionally substituted and the compounds having from 2 to 4 rings condensed, each cycle being capable of contributing to the valence layer of the metal M by 6 or 7 ⁇ electrons;
• L 3 represents from 0 to 3 identical or different ligands linked to the metal M by ⁇ electrons, ligand (s) chosen from CO and N ⁇ 2 + ; the total electronic charge q of the complex to which L ' ', L 2 and L 3 contribute and the ionic charge of the metal M being positive and equal to 1 or 2;
• the borate anionic entity has the formula [BX a R ⁇ ] " (III) in which:
• a phenyl radical substituted by at least one electron-withdrawing group such as for example OCF3, CF3, NO2, CN, and / or by at least 2 halogen atoms (especially fluorine), and this when the cationic entity is an onium an element from groups 15 to 17,
• a phenyl radical substituted by at least one element or an electron-withdrawing group in particular a halogen atom (particularly fluorine), CF3, OCF3, NO2, CN, and this when the cationic entity is an organometallic complex of an element of the groups 4 to 10
• an aryl radical containing at least two aromatic rings such as for example biphenyl, naphthyl, optionally substituted by at least one element or an electron-withdrawing group, in particular a halogen atom (fluorine in particular), OCF3, CF3, NO2, CN, whatever the cationic entity.
• the photoinitiators used are selected with a residual absorption of the UN light. between 200 and 500 nm, preferably 400 to 500 nm for the preparation of dental prostheses. For dental restoration, a photoinitiator having residual absorption of UN light is preferred. beyond 400 nm.
• the species of the anionic borate entity which are very particularly suitable are the following:
• organometallic salts (4) which can be used are described in documents US-A-4,973,722, US-A-4,992,572, EP-A-203,829, EP-A-323,584 and EP- A-354 181.
• the organometallic salts more readily used according to the invention are in particular:. ( ⁇ 5 - cyclopentadienyl) ( ⁇ 6 - toluene) Fe + >
• photoinitiators of the onium borate type of the following products: ( ⁇ 5 - cyclopentadienyl) ( ⁇ 6 - toluene) Fe + , [B (C6Fs)] ". ( ⁇ 5 - cyclopentadienyl) ( ⁇ 6 - methyll-naphthalene) Fe + , [B (CgF5)] " . ( ⁇ 5 - cyclopentadienyl) ( ⁇ 6 - cumene) Fe + , [B (C6F5) 4 ] ⁇
• this can comprise at least one aromatic hydrocarbon photosensitizer with one or more substituted or unsubstituted aromatic rings, having a residual absorption of light of between 200 and 500 nm.
• This photosensitizer can be very varied in nature. This can respond in particular to one of the following formulas (IV) to (XXII):
• Ar ⁇ represents an aryl radical containing from 6 to 18 carbon atoms, a tetrahydronaphthyl, thienyl, pyridyl or furyl radical or a phenyl radical bearing one or more substituents chosen from the group consisting of F, Cl, Br, CN, OH, linear or branched C1-C12 alkyls.
• represents a Cg-C ⁇
• - X represents a group -OR or -OSiR 3 (R9) 2 or forms, with R 4 , a group -O-CH (R 10 ) -, - R4 represents an alkyl radical linear or branched C-Cg unsubstituted or carrying a group -OH, -OR 6 , C2-C8 acyloxy, -COOR 6 , -CF 3 , or -CN, an alkenyl radical in C3 or C 4 , an aryl radical in Cg to CJ S - a radical phenylalkyl in Cj to Cg,
• R5 has one of the meanings given for R 4 OR represents a radical -CH2CH2R 1 1 , or also forms with R 4 , an alkylene radical in C2-Cg or an oxa-alkylene or aza-alkylene radical in C3-C9,
• R *> represents a lower alkyl radical containing from 1 to 12 carbon atoms
• - R? represents a hydrogen atom, an alkyl radical in C-
• R ** and R9 are the same or different and each represents a C -) - C alkyl radical or a phenyl radical,
• R '10 represents a hydrogen atom, an alkyl radical in C j C6 alkyl or phenyl radical,
• R 11 represents a radical -CONH 2 , -CONHR 6 , -CON (R 6 ) 2 , -P (O) (OR 6 ) 2 or pyhdyle-2;
• radicals may be substituted by one or more substituents selected from the group consisting of -F, -Cl, -Br, -CN, -OH , -CF3 ,, -OR 6 , -SR 6 , - COOR 6 , linear or branched C1-C-12 alkyl radicals optionally carrying a group -OH, -OR 6 and / or -CN, and the radicals linear or branched C-
• - Y identical or different, represent X and / or R 4 , - Z represents:
• R ⁇ 2 represents an alkylene radical in C2-C8, alkenylene in C -Cg or xylylene.
• substituent (s) on the aromatic nucleus (s) represent a linear or branched C1-C12 alkyl radical, a C6-C12 cycloalkyl radical, a radical Ar, a halogen atom, a group -OH, -CN, -NO2, -COOR 6 , -CHO, Ophenyl, -CF3, -SR 6 , -Sphenyl, -SO2 phenyl, Oalkenyl, or -SiR 3.
• R 18 17 - R identical or different, has the same meaning as R or represents a group -NR 2 'for example 3,3'carbonylbis (7-diethylaminocoumarin) and 3,3'-carbonylbis (7-methoxycoumarin).
• photosensitizers have a residual absorption of light UN. between 200 and 500 nm, preferably 400 to 500 nm for the preparation of dental prostheses For dental restoration, a photosensitizer having residual absorption of light UN is preferred. beyond 400 nm.
• the photosensitizers will be chosen from those of families (IV), (VII) and (VIII).
• families (IV), (VII) and (VIII) mention will be made of the following phosensitizers 4,4'dimethoxybenzoin; phenanthrenequinone;
• fillers can be used to prepare the compositions according to the invention.
• the fillers are chosen as a function of the final use of the dental composition, these affect important properties such as appearance, penetration of UN radiation. , as well as the mechanical and physical properties of the material obtained after crosslinking and / or polymerization of the dental composition
• filler As reinforcing filler, it is possible to use charges of treated or untreated pyrogenation silica, charges of amorphous silica, quartz, glasses or non-vitreous charges based on zirconium, barium, calcium and fluorine oxides. , aluminum, titanium, zinc, borosilicates, aluminosilicates, talc, spherosil, yterbium t ⁇ fluoride, fillers based on polymers in the form of ground powder such as inert or functionalized polymethacrylates, polyepoxides or polycarbonates
• the fillers and in particular the silica fillers are treated before use at 120 ° C. with an amount of less than 10% w / w of silicone comprising at least one unit of formula (XXIII).
• the material obtained after crosslinking exhibits clearly improved mechanical strength, modulus of elasticity, and compressive strength.
• pigments can be used to tint the dental composition according to the intended use and the ethnic groups.
• red pigments are used in the presence of microfibers for the dental compositions used for the preparation of dental prostheses in order to simulate the blood vessels.
• Pigments based on metal oxides are also used for the dental compositions used for the preparation of restorative material, in order to obtain a material reticulated in ivory color.
• Other additives can be incorporated into the dental compositions according to the invention. For example, biocides, stabilizers, flavoring agents, plasticizers and adhesion promoters.
• crosslinkable and / or polymerizable co-reagents of the organic type will advantageously be used.
• These co-reagents are liquid at room temperature or hot-melt at temperatures below 100 ° C, and each co-reagent comprises at least two reactive functions such as oxetane-alkoxy, oxetane-hydroxy, oxetane-alkoxysilyl, carboxy-oxetane, oxetane- oxetane, alkenylether-hydroxy, alkenylether-alkoxysilyl, epoxy-alkoxy, epoxy-alkoxysilyl, dioxolane-dioxolane-alcohol, etc.
• the dental compositions according to the invention can be used for numerous dental applications, and in particular in the field of dental prostheses, in the field of dental restoration and in the field of temporary teeth.
• the dental composition according to the invention is preferably in the form of a single product containing the various components ("single component") which facilitates its implementation, in particular in the field of dental prostheses. Possibly, the stability of this "monocomponent" product can be provided by organic derivatives with amino functions according to the teaching of document WO 98/07798.
• the product can for example be deposited using a syringe directly on the plaster model or in a core. Then it is polymerized (polymerization by possible successive layers) using an A lamp. (visible light spectrum 200 - 500 nm). In general, the realization of an esthetic and durable dental prosthesis is carried out in 10 to 15 minutes.
• the products obtained from the dental composition according to the invention are non-porous.
• the surface of dental prostheses obtained is smooth and shiny and therefore does not require the use of varnish.
• the dental composition according to the invention can be used as filling material for anterior and posterior teeth in different colors (e.g., VITA "), fast and easy to implement.
• the dental composition being non-toxic and polymerizable in thick layers, it is not essential to polymerize the material in successive layers. In general, a single injection of the dental composition is sufficient.
• the tooth can be pretreated with a bonding primer or the dental composition can be prepared in admixture with a bonding primer before its use.
• a bonding primer it is not essential to use the dental composition according to the invention.
• compositions of the examples are the following:
• Example 1 Composition for dental prosthesis.
• siloxane (A) stabilized with 50 ppm of Tinuvin 765 - 1 part of the photoinitiator (P1) at 75% in ethyl acetate; - 150 parts of an inert filler based on polymethyl methacrylate pigmented in pink (LUXASELF product from dental LG).
• composition obtained is stable in the absence of light for several months at room temperature. This composition can be worked by hand and for several hours in the light of day.
• test tube 2.8 ⁇ 0.3 mm thick is produced in a glass capsule 64 mm long (model), 10 mm wide (model) and open at the top by pouring the prepared composition ("single-component") into the capsule.
• composition is dried by passing the capsule for 1 to 2 seconds (3 m / min) under a UN lamp.
• power 200 W / cm corresponding to the excitation of a mixture of mercury and gallium and emitting in the visible UV range beyond 400 nm.
• the product obtained is demolded by breaking the glass.
• the SHORE D hardness of the two polymerized compositions is determined on each side of the part produced immediately after crosslinking.
• Shore D hardness continues to change significantly for a few hours.
• the volume shrinkage is very low and excellent dimensional stability is obtained.
• the loss of mass is less than 1%.
• the product can be used with or without primer in the presence of artificial teeth or natural teeth.
• the properties of the material obtained are in accordance with standard DI ⁇ / ISO 1567.
• Example 2 Dental composition.
• composition is formulated with:
• the crosslinking-polymerization operation is carried out using a lamp emitting a light spot emitted through a curved light tip of 8 mm in diameter.
• the source is an Optibulb 80 W lamp (DEMETRON Optilux 500) for wavelengths between 400 and 520 nm.
• the dental composition is applied in a tooth.
• a thickness of 5 mm is crosslinked in less than 30 seconds.
• the stiffness values found are greater than 60 Mpa according to ISO 1567 standard.
• Example 3 composition for dental prosthesis or dental restoration material.
• the crosslinking operation is carried out in an identical manner to that of Example 2.
• a composition 5 mm thick is crosslinked in less than 30 seconds.
• the color of the material after crosslinking approximates the ivory color.
• composition in this case, is particularly suitable for dental prostheses, in particular the rigidity is greater than 60 Mpa according to standard ISO 1567.

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• Health & Medical Sciences (AREA)
• Oral & Maxillofacial Surgery (AREA)
• Life Sciences & Earth Sciences (AREA)
• Epidemiology (AREA)
• Animal Behavior & Ethology (AREA)
• General Health & Medical Sciences (AREA)
• Public Health (AREA)
• Veterinary Medicine (AREA)
• Plastic & Reconstructive Surgery (AREA)
• Biophysics (AREA)
• Dental Preparations (AREA)
• Epoxy Resins (AREA)

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• 1998
  • 1998-10-02 FR FR9812374A patent/FR2784024B1/fr not_active Expired - Fee Related
• 1999
  • 1999-10-01 EP EP99946277A patent/EP1117367B1/de not_active Expired - Lifetime
  • 1999-10-01 WO PCT/FR1999/002344 patent/WO2000019966A1/fr active IP Right Grant
  • 1999-10-01 ES ES99946277T patent/ES2212629T3/es not_active Expired - Lifetime
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• 2006
  • 2006-03-08 US US11/370,817 patent/US8262391B2/en not_active Expired - Fee Related

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